The first 5.5-magnitude earthquake hit Sumatra at 8.08am and the second 5.6-magnitude quake hit the same place at 11.01am Tuesday.

Calls came pouring in from Selayang Hospital, KLCC building and other highrises in the Klang Valley as many residents ran out of their buildings

However, there was no tsunami threat, said the Malaysian Meteorological Department.

Information about damage or casualties has yet to come in.

Meanwhile, Bernama reported that Kuala Lumpur Fire and Rescue Department assistant director of the fire division Azizan Ismail said people in several high-rise buildings in the city called in to report the tremors.

Among the buildings in Kuala Lumpur where the tremors were felt at about 11am were Wisma Bernama, Menara Kenanga, the Tenaga Nasional Bhd (TNB) headquarters and Megan Avenue.

Azizan said the tremors were more intense from the eighth floor upwards, but added that there were no reports of damage.

M. Govind Nair, 60, Bernama's assistant editor at the English Sub-Editing Desk at Wisma Bernama, said he felt the tremors at about 11 am.

"The tremors lasted for five to six seconds. My chair shook a bit, and then I felt a little dizzy," he said.